package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.util.Beta;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.time.LocalDateTime;


/**
 * 自定义切面类，统一拦截AutoFill注解的方法，进行自动填充公共字段
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {


    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }


    /**
     * 前置通知，在通知中进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Exception {
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        //判空
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, localDateTime.getClass());
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, currentId.getClass());
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, localDateTime.getClass());
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, currentId.getClass());

            setCreateTime.invoke(entity, localDateTime);
            setUpdateTime.invoke(entity, localDateTime);
            setCreateUser.invoke(entity, currentId);
            setUpdateUser.invoke(entity, currentId);
        } else if (operationType == OperationType.UPDATE) {
            //为4个公共字段赋值
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, localDateTime.getClass());
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, currentId.getClass());

            setUpdateTime.invoke(entity, localDateTime);
            setUpdateUser.invoke(entity, currentId);

        }

    }

}
